Paper-hanger&#39;s straightedge



July 1 1924.

- 1,499,874 J. REINHART PAPER mmezn's s'rauearsnca Filed Feb. '7. 1923 F/jl.

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IN KEN TOR. W

ATTORNEY Patented July 1, 1924.

UNITED STATES JOHN REINHARE OF CHICAGO, ILLINOIS.

PAPER-HANGERS STRAIGHTEDGE.

A lication filed February 7, 1923.

To all whom it may concerns Be it known that I, JOHN R-nrNHAR'r, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Paper Hangers" Straightedges, and declare the following to be a full, clear, and eXact description of the same, such as will enable others skilled in the art to which it pertainsto make and use the same, reference being had to the accompanying drawing, which forms a part of this specification.

The most satisfactory method of trimming the edges of wall paper so as to insure that they will be perfectly straight, is to lay a straight edge on the paper to serve as a guide for the knife by means of which the paper is trimmed. Unless the straight edge be true the line of the cut will not be straight, but all of the straight edges that I have ever seen used for this purpose have soon become warped or otherwise distorted, so that satisfactory results could no longer be obtained therewith.

The object of the present invention is to produce a straight edge built up in such a manner that it will retain its initial shape indefinitely, and the manufacturing cost of which shall be low enough to make the commercial use thereof practicable.

The various features of novelty whereby my invention is characterized will hereinafter be pointed out with particularity in the claims; but for a full understanding of my invention and its objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

Figure 1 is a plan view of one edge of a straight edge, arranged in accordance with my invention;

Figure 2 is an edge view and Figure 3 an end view of the device; and

Figure 4 is an end View of a slightly modified form of straight edge.

Referring to Figures 1 to 3, 1, 2 and 3 represent the three plies or layers of a long narrow three-ply wooden panel which forms the body portion of my improved straight edge. Any desired number of plies may of course be used, but I have found three plies to serve very well for the construction of straight edges about three inches wide and five eighths of an inch thick, which is one of the sizes commonly used. The grain of the wood in the two outer layers runs in the Serial No. 617,441.

direction of the length of the panel, while the grain in the central layer is arranged crosswise. The several plies are glued together in any usual or suitable manner, either in sizes adapted to form single units or in sheets large enough to form a plurality of straight edge panels when out up. Glued to each long edge of the central panel is a facing strip 4 of any desired width and preferably of the same or approximately the same thickness as the central panel.

Since these straight edges often become Y these grooves. In the arrangement shown,

the grooves have a width equal to the thickness of the central layer or ply, so that the grooves are produced by simply making the central layer or ply narrower than the outer layers. If the panels are built up as individual units, the central layer or ply may simply be made narrower than the two outer layers or plies, or it may be made the same width as the latter, the grooves being afterwards formed by means'of a suitable cutting tool. In any event, the central panel when finished, has grooves adapted to receive the tongues 5 on the facing strips.

The arrangement shown in Fig. 4 is similar to that just described, except that the central layer or ply of the panel or body of the device is formed out of a thick core 6 in which the grain extends crosswise, together with extremely thin facing layers 7' and 8 of veneer, in which the grain runs lengthwise. This form of central ply may be useful when individual panels are glued up one at a time, since it affords a simple way of securing the long strips of wood in which the grain extends crosswise; the thin layers of veneer preventing the core strip from breaking during the operation of building up the individual panels.

lVhile I have illustrated and described with particularity only a single preferred form of my invention, with a slight modification, I do not desire to be limited to the terms employed in the definitions of my 'in' vention constituting the appended claims.

I claim: 7 r

1. A straight edge eomprising a long narrow central three-ply Wooden panel in which :the grain in one ply extends transverse to'the grain in the other tWo plies, the middle ply beingnarrower so as to produce a groove in each long edge of the panel, and facing stripsiextending along saidedges of the said panel and having tongues fitting intosaid grooves.

2. A: straight 'edge' -comprising a long "narrow three-ply wooden panel, the grain the apanel the central ply being narrower than the other plies so as to produce a groove ,in each long edge of the p'anel, and strips of solid Wood of about the same thickness as the panel fitting against the long grain of one ply extends transverse to the grain in the other two plies, the middle ply .being narrower so as to produce a groove in each long edgeof the panel, and facing strips extending along said edges of the panel and having tongues :fitted into and secured in saidagroovesysaid rfacing rstrips having outer edges arranged at right angles ito-thelhoard facesfof said panel and at least as Wide-as V the. greatest thickness of saidpanel.

cation.

JO N 'REINHART In testimony whereof I sign this specifi- 

